<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>弹出二级菜单小测试</title>
    <style>
        #div1 ul{
            list-style-type: none;
            padding: 0;
            display: none;
        }
        #div1{
            height: 200px;
            width:200px;
            background-color: #eaecec;
        }
        #div1 ul li{
            width: 100px;
            border: 1px solid silver;
            font-family: 华文楷体;
            text-align: center;
            line-height: 30px;
        }
        #div1:hover ul{
            display: block;
        }
    </style>
</head>
<body>
    <div id="div1">
        <ul>
            <li>aaa</li>
            <li>bbb</li>
            <li>ccc</li>
            <li>aaa</li>
            <li>bbb</li>
            <li>ccc</li>
        </ul>
    </div>
</body>
</html>